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MAVEN专题之八、大型Maven项目，快速按需任意构建，必备神技能！相知恨晚！...
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maven系列目标：从入门开始开始掌握一个高级开发所需要的maven技能。
这是maven系列第8篇。
整个maven系列的内容前后是有依赖的，如果之前没有接触过maven，建议从第一篇看起，本文尾部有maven完整系列的连接。
本篇涉及到的内容属于神技能，多数使用maven的人都经常想要的一种功能，但是大多数人都不知道如何使用，废话不多说，上干货。
需求背景
我们需要做一个电商项目，一般都会做成微服务的形式，按业务进行划分，本次我们主要以账户业务和订单业务为例，我们将这两块业务分别作为2个大的模块来开发，而订单模块又会调用账户模块中的接口，所以对账户模块接口部分会有依赖。
我们以maven来搭建项目，项目的目录结构如下：
b2b b2b-account b2b-account-api b2b-account-service b2b-order b2b-order-api b2b-order-service
b2b-account
账户模块，其中包含2个小模块：b2b-account-api和b2b-account-service
b2b-account-api
账户模块对外暴露的接口部分，以供外部调用
b2b-account-service
账户模块具体业务实现，依赖于b2b-account-api模块
b2b-order
订单模块，也是包含2个小模块：b2b-order-api和b2b-order-service
b2b-order-api
订单模块对外暴露的接口部分，以供外部调用
b2b-order-service
订单模块具体业务实现，依赖2个模块b2b-order-api、b2b-account-api
搭建项目结构
我们按照上面的需求，使用maven搭建项目结构，具体过程如下。
创建b2b项目
打开idea，点击File->New->Project，如下图：
选择Maven，如下图：
点击上图的Next，输入坐标信息，如下图：
点击上图的Next，输入Project Name为b2b，如下图：
点击上图的Finish，完成项目的创建，如下图：
删除下图中无用的代码：
变成了下面这样：
配置一下idea的maven环境，点击File->Settings，如下图：
点击上面的OK完成配置。
在b2b下创建b2b-account模块
注意这里是创建模块，不是项目了，注意下面的操作过程。
选中b2b项目目录，如下图：
点击File->New->Module，如下图：
选择Maven，如下图：
点击Next，如下图：
点击上面第二个...，将Parent置为None，如下图：
输入坐标信息，如下图：
点击上图中的Next，输入Project name为b2b-account，如下图：
点击Finish，完成b2b-account模块的创建，如下图：
删除b2b-account中src目录，如下图：
项目结构变成了下面这样：
在b2b-account模块下面创建b2b-account-api模块
选中b2b-account，如下图：
点击File->New->Module，如下图：
选择Maven，如下图：
点击上图中的Next，如下图：
将上面的Add as module to设置为b2b-account模块，表示新增的这个模块被b2b-account聚合进行管理。
点击Parent后面的...，选择None，将Parent对应的值置为None。
如下图：
输入坐标信息，如下图：
点击Next，默认如下图：
我们需要对上面3个输入框的值进行修改，修改成下面这样：
点击Finish，完成创建，如下图：
在b2b-account模块下创建b2b-account-service模块
这个过程参考在b2b-account模块下面创建b2b-account-api模块。
在b2b下创建b2b-order模块
这个过程参考在b2b下创建b2b-account模块。
在b2b-order模块下面创建b2b-order-api模块
这个过程参考在b2b-account模块下面创建b2b-account-api模块。
在b2b-order模块下面创建b2b-order-service模块
这个过程参考在b2b-account模块下面创建b2b-account-api模块。
项目结构创建成功
上面都创建成功之后，项目结构如下图
参与过大型maven项目开发的是不是很熟悉很亲切，多数互联网项目的maven结构就是这样一大片maven模块。
引入项目依赖
b2b-account-service依赖于b2b-account-api模块，所以在b2b-account-service/pom.xml中加入下面配置：
<dependencies> <dependency> <groupId>${project.groupId}</groupId> <artifactId>b2b-account-api</artifactId> <version>${project.version}</version> </dependency></dependencies>
由于项目的
groupId,version都是一样的，所以直接通过${}这种方式引用了。
b2b-order-service依赖2个模块b2b-order-api、b2b-account-api，所以在b2b-order-service/pom.xml中加入下面配置：
<dependencies> <dependency> <groupId>${project.groupId}</groupId> <artifactId>b2b-account-api</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>b2b-order-api</artifactId> <version>${project.version}</version> </dependency></dependencies>
此时每个模块pom.xml如下
b2b/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>b2b-account</module> <module>b2b-order</module> </modules></project>
b2b-account/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-account</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>b2b-account-api</module> <module>b2b-account-service</module> </modules></project>
b2b-account-api/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-account-api</artifactId> <version>1.0-SNAPSHOT</version></project>
b2b-account-service/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-account-service</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>${project.groupId}</groupId> <artifactId>b2b-account-api</artifactId> <version>${project.version}</version> </dependency> </dependencies></project>
b2b-order/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-order</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>b2b-order-api</module> <module>b2b-order-service</module> </modules></project>
b2b-order-api/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-order-api</artifactId> <version>1.0-SNAPSHOT</version></project>
b2b-order-service/pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-order-service</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>${project.groupId}</groupId> <artifactId>b2b-account-api</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>b2b-order-api</artifactId> <version>${project.version}</version> </dependency> </dependencies></project>
注意：上面项目的结构属于父子结构，使用maven中聚合的方式进行管理的，对应聚合不是太了解的，可以看上篇文章有详细介绍。
b2b中包含了2个子模块
b2b_account和b2b_order，这3个package都是pom。b2b_account中包含了2个子模块，2个子模块package是默认的jar类型。
b2b_order中包含了2个子模块，2个子模块package是默认的jar类型。
反应堆
上面项目都开发好了，我们需要安装到本地仓库，一般情况下，我们会这么做，在b2b/pom.xml所在目录执行下面命令：
mvn clean install
我们来感受一下这个命令的效果：
D:\code\IdeaProjects\b2b>mvn clean install[INFO] Scanning for projects...[INFO] ------------------------------------------------------------------------[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-account-service [jar][INFO] b2b-account [pom][INFO] b2b-order-api [jar][INFO] b2b-order-service [jar][INFO] b2b-order [pom][INFO] b2b [pom][INFO][INFO] ------------------< com.javacode2018:b2b-account-api >------------------[INFO] Building b2b-account-api 1.0-SNAPSHOT [1/7][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom[INFO][INFO] ----------------< com.javacode2018:b2b-account-service >----------------[INFO] Building b2b-account-service 1.0-SNAPSHOT [2/7][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-service ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-service ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-service ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-service ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.pom[INFO][INFO] --------------------< com.javacode2018:b2b-account >--------------------[INFO] Building b2b-account 1.0-SNAPSHOT [3/7][INFO] --------------------------------[ pom ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account ---[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account\1.0-SNAPSHOT\b2b-account-1.0-SNAPSHOT.pom[INFO][INFO] -------------------< com.javacode2018:b2b-order-api >-------------------[INFO] Building b2b-order-api 1.0-SNAPSHOT [4/7][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom[INFO][INFO] -----------------< com.javacode2018:b2b-order-service >-----------------[INFO] Building b2b-order-service 1.0-SNAPSHOT [5/7][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom[INFO][INFO] ---------------------< com.javacode2018:b2b-order >---------------------[INFO] Building b2b-order 1.0-SNAPSHOT [6/7][INFO] --------------------------------[ pom ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order ---[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order\1.0-SNAPSHOT\b2b-order-1.0-SNAPSHOT.pom[INFO][INFO] ------------------------< com.javacode2018:b2b >------------------------[INFO] Building b2b 1.0-SNAPSHOT [7/7][INFO] --------------------------------[ pom ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b ---[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b ---[INFO] Installing D:\code\IdeaProjects\b2b\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b\1.0-SNAPSHOT\b2b-1.0-SNAPSHOT.pom[INFO] ------------------------------------------------------------------------[INFO] Reactor Summary for b2b 1.0-SNAPSHOT:[INFO][INFO] b2b-account-api .................................... SUCCESS [ 1.806 s][INFO] b2b-account-service ................................ SUCCESS [ 0.298 s][INFO] b2b-account ........................................ SUCCESS [ 0.082 s][INFO] b2b-order-api ...................................... SUCCESS [ 0.229 s][INFO] b2b-order-service .................................. SUCCESS [ 0.254 s][INFO] b2b-order .......................................... SUCCESS [ 0.058 s][INFO] b2b ................................................ SUCCESS [ 0.069 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 3.072 s[INFO] Finished at: 2019-11-20T16:03:27+08:00[INFO] ------------------------------------------------------------------------
注意上面有这样的输出：
[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-account-service [jar][INFO] b2b-account [pom][INFO] b2b-order-api [jar][INFO] b2b-order-service [jar][INFO] b2b-order [pom][INFO] b2b [pom]
maven会根据模块之间的依赖关系，然后会得到所有模块的构建顺序，上面共有7个pom.xml文件，也就是7个maven构件，按照上面列出的顺序依次进行构建。
可以看到b2b-account-api是被其他一些模块依赖的，所以这个放在了第一个。
mvn命令对多模块构件时，会根据模块的依赖关系而得到模块的构建顺序，这个功能就是maven的反应堆（reactor）做的事情，反应堆会根据模块之间的依赖关系、聚合关系、继承关系等等，从而计算得出一个合理的模块构建顺序，所以反应堆的功能是相当强大的。
按需随意构建
有这样的一种场景：b2b-account-api被b2b-account-service和b2b-order-service依赖了，所以当b2b-account-api有修改的时候，我们希望他们3个都能够被重新构建一次，而不是去对所有的模块都进行重新构建，我们只希望被影响的模块都能够参与重新构建，大家有什么好的办法？
上面列出的只是2个模块的功能，真正的电商项目还有很多模块，如果每次修改一个模块，我们都去重新打包所有的模块，这个构建过程耗时是非常久的，只能干等着，我们需要的是按需构建，需要构建哪些模块让我们自己能够随意指定，这样也可以加快构建的速度，所以我们需要这样的功能
maven反应堆帮我们考虑到了这种情况，mvn命令提供了一些功能可以帮我们实现这些操作，我们看一下mvn的帮助文档，mvn -h可以查看帮助，如下：
D:\code\IdeaProjects\b2b>mvn -husage: mvn [options] [<goal(s)>] [<phase(s)>]Options: -am,--also-make If project list is specified, also build projects required by the list -amd,--also-make-dependents If project list is specified, also build projects that depend on projects on the list -B,--batch-mode Run in non-interactive (batch) mode (disables output color) -b,--builder <arg> The id of the build strategy to use -C,--strict-checksums Fail the build if checksums don't match -c,--lax-checksums Warn if checksums don't match -cpu,--check-plugin-updates Ineffective, only kept for backward compatibility -D,--define <arg> Define a system property -e,--errors Produce execution error messages -emp,--encrypt-master-password <arg> Encrypt master security password -ep,--encrypt-password <arg> Encrypt server password -f,--file <arg> Force the use of an alternate POM file (or directory with pom.xml) -fae,--fail-at-end Only fail the build afterwards; allow all non-impacted builds to continue -ff,--fail-fast Stop at first failure in reactorized builds -fn,--fail-never NEVER fail the build, regardless of project result -gs,--global-settings <arg> Alternate path for the global settings file -gt,--global-toolchains <arg> Alternate path for the global toolchains file -h,--help Display help information -l,--log-file <arg> Log file where all build output will go (disables output color) -llr,--legacy-local-repository Use Maven 2 Legacy Local Repository behaviour, ie no use of _remote.repositories. Can also be activated by using -Dmaven.legacyLocalRepo=true -N,--non-recursive Do not recurse into sub-projects -npr,--no-plugin-registry Ineffective, only kept for backward compatibility -npu,--no-plugin-updates Ineffective, only kept for backward compatibility -nsu,--no-snapshot-updates Suppress SNAPSHOT updates -ntp,--no-transfer-progress Do not display transfer progress when downloading or uploading -o,--offline Work offline -P,--activate-profiles <arg> Comma-delimited list of profiles to activate -pl,--projects <arg> Comma-delimited list of specified reactor projects to build instead of all projects. A project can be specified by [groupId]:artifactId or by its relative path -q,--quiet Quiet output - only show errors -rf,--resume-from <arg> Resume reactor from specified project -s,--settings <arg> Alternate path for the user settings file -t,--toolchains <arg> Alternate path for the user toolchains file -T,--threads <arg> Thread count, for instance 2.0C where C is core multiplied -U,--update-snapshots Forces a check for missing releases and updated snapshots on remote repositories -up,--update-plugins Ineffective, only kept for backward compatibility -v,--version Display version information -V,--show-version Display version information WITHOUT stopping build -X,--debug Produce execution debug output
上面列出了mvn命令后面的一些选项，有几个选项本次我们需要用到，如下：
-pl,--projects <arg>
构件指定的模块，arg表示多个模块，之间用逗号分开，模块有两种写法
-pl 模块1相对路径 [,模块2相对路径] [,模块n相对路径]-pl [模块1的groupId]:模块1的artifactId [,[模块2的groupId]:模块2的artifactId] [,[模块n的groupId]:模块n的artifactId]
举例：
下面命令都是在b2b/pom.xml来运行
mvn clean install -pl b2b-accountmvn clean install -pl b2b-account/b2b-account-apimvn clean install -pl b2b-account/b2b-account-api,b2b-account/b2b-account-servicemvn clean install -pl :b2b-account-api,b2b-order/b2b-order-apimvn clean install -pl :b2b-account-api,:b2b-order-service
-rf,--resume-from <arg>
从指定的模块恢复反应堆
-am,--also-make
同时构建所列模块的依赖模块
-amd,--also-make-dependents
同时构件依赖于所列模块的模块
下面我们通过6个案例细说上面这些用法。
注意：下面所有案例都在b2b/pom.xml所在目录执行。
案例1
只构建p-account模块，运行命令
mvn clean install -pl b2b-account
效果如下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account[INFO] Scanning for projects...[INFO][INFO] --------------------< com.javacode2018:b2b-account >--------------------[INFO] Building b2b-account 1.0-SNAPSHOT[INFO] --------------------------------[ pom ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account ---[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account\1.0-SNAPSHOT\b2b-account-1.0-SNAPSHOT.pom[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 0.907 s[INFO] Finished at: 2019-11-20T16:12:51+08:00[INFO] ------------------------------------------------------------------------
可以看到只构建了b2b-account。
案例2
只构建b2b-account-api模块，运行命令：
mvn clean install -pl b2b-account/b2b-account-api
效果如下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api[INFO] Scanning for projects...[INFO][INFO] ------------------< com.javacode2018:b2b-account-api >------------------[INFO] Building b2b-account-api 1.0-SNAPSHOT[INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 2.853 s[INFO] Finished at: 2019-11-20T16:14:37+08:00[INFO] ------------------------------------------------------------------------
上面使用的是相对路径的写法，还有2种写法，大家可以去试试，如下：
mvn clean install -pl :b2b-account-apimvn clean install -pl com.javacode2018:b2b-account-api
案例3
构建b2b-account-api和b2b-order-api，运行下面命令：
mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api
效果如下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api[INFO] Scanning for projects...[INFO] ------------------------------------------------------------------------[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-order-api [jar][INFO][INFO] ------------------< com.javacode2018:b2b-account-api >------------------[INFO] Building b2b-account-api 1.0-SNAPSHOT [1/2][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom[INFO][INFO] -------------------< com.javacode2018:b2b-order-api >-------------------[INFO] Building b2b-order-api 1.0-SNAPSHOT [2/2][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom[INFO] ------------------------------------------------------------------------[INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:[INFO][INFO] b2b-account-api .................................... SUCCESS [ 2.874 s][INFO] b2b-order-api ...................................... SUCCESS [ 0.393 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 3.554 s[INFO] Finished at: 2019-11-20T16:15:57+08:00[INFO] ------------------------------------------------------------------------
上面输出中可以看到只构建了2个目标模块。
案例4
我们只修改了b2b-account-api代码，所以我希望对这个重新打包，并且对这个有依赖的也重新打包，所以需要打包下面3个模块：
b2b-account-apib2b-account-serviceb2b-order-service
上面列表中的后面两个是依赖于b2b-account-api的，可以在b2b/pom.xml中执行下面命令：
mvn clean install -pl b2b-account/b2b-account-api -amd
我们看一下效果：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api -amd[INFO] Scanning for projects...[INFO] ------------------------------------------------------------------------[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-account-service [jar][INFO] b2b-order-service [jar][INFO][INFO] ------------------< com.javacode2018:b2b-account-api >------------------[INFO] Building b2b-account-api 1.0-SNAPSHOT [1/3][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom[INFO][INFO] ----------------< com.javacode2018:b2b-account-service >----------------[INFO] Building b2b-account-service 1.0-SNAPSHOT [2/3][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-service ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-service ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-service ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-service ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.pom[INFO][INFO] -----------------< com.javacode2018:b2b-order-service >-----------------[INFO] Building b2b-order-service 1.0-SNAPSHOT [3/3][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom[INFO] ------------------------------------------------------------------------[INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:[INFO][INFO] b2b-account-api .................................... SUCCESS [ 2.440 s][INFO] b2b-account-service ................................ SUCCESS [ 0.381 s][INFO] b2b-order-service .................................. SUCCESS [ 0.364 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 3.508 s[INFO] Finished at: 2019-11-20T16:05:00+08:00[INFO] ------------------------------------------------------------------------
从上面输出中看一下反应堆列出的构建顺序：b2b-account-api、b2b-account-service、b2b-order-service。
上面过程给大家捋一捋：
上面命令先会运行-pl b2b-account-api得到一个反应堆列表，如下，只有一个模块：
b2b-account-api
然后后面又会执行amd，这个命令会找到对-pl b2b-account-api有依赖的构件，也就是：
b2b-account-serviceb2b-order-serivce
然后反应堆会对3个构件进行排序，得到一个正确的构件顺序，如下：
[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-account-service [jar][INFO] b2b-order-service [jar]
然后maven会依次对他们执行：
mvn clean install
案例5
需求：我们来构建b2b-order-service，希望b2b-account-service依赖的构件也能被同时构建，b2b-account-service依赖于b2b-account-api和b2b-order-api，可能b2b-account-service会依赖的更多。
可以使用下面命令：
mvn clean install -pl b2b-order/b2b-order-service -am
效果如下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-order/b2b-order-service -am[INFO] Scanning for projects...[INFO] ------------------------------------------------------------------------[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-order-api [jar][INFO] b2b-order-service [jar][INFO][INFO] ------------------< com.javacode2018:b2b-account-api >------------------[INFO] Building b2b-account-api 1.0-SNAPSHOT [1/3][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom[INFO][INFO] -------------------< com.javacode2018:b2b-order-api >-------------------[INFO] Building b2b-order-api 1.0-SNAPSHOT [2/3][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom[INFO][INFO] -----------------< com.javacode2018:b2b-order-service >-----------------[INFO] Building b2b-order-service 1.0-SNAPSHOT [3/3][INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---[INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---[INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar[INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom[INFO] ------------------------------------------------------------------------[INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:[INFO][INFO] b2b-account-api .................................... SUCCESS [ 2.509 s][INFO] b2b-order-api ...................................... SUCCESS [ 0.343 s][INFO] b2b-order-service .................................. SUCCESS [ 0.340 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 3.455 s[INFO] Finished at: 2019-11-20T16:46:45+08:00[INFO] ------------------------------------------------------------------------
从上面输出中看一下反应堆列出的构建顺序：b2b-account-api、b2b-order-api、b2b-order-service。
上面过程给大家捋一捋：
上面命令先会运行-pl b2b-order-service得到一个反应堆列表：
b2b-order-service
然后后面又会执行am，这个命令会找到-pl b2b-order-service依赖的构件，也就是：
b2b-account-apib2b-order-api
然后反应堆会对3个构件进行排序，得到一个正确的构件顺序，如下：
[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-order-api [jar][INFO] b2b-order-service [jar]
然后maven会依次对他们执行：
mvn clean install
案例6
分别执行下面2条mvn命令，先看一下效果：
mvn clean installmvn clean install -rf b2b-order/b2b-order-service
输出中我们取出部分内容，如下。
第一条命令，反应堆产生的构建顺序是：
[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-account-service [jar][INFO] b2b-account [pom][INFO] b2b-order-api [jar][INFO] b2b-order-service [jar][INFO] b2b-order [pom][INFO] b2b [pom]
第2条命令，反应堆产生的构建顺序是：
[INFO] Reactor Build Order:[INFO][INFO] b2b-order-service [jar][INFO] b2b-order [pom][INFO] b2b [pom]
在仔细看一下上面2条命令的差别，后面的命令多了-rf b2b-order/b2b-order-service，具体过程如下：
会先执行下面命令
mvn clean install
反应堆会计算出需要构件的模块顺序，如下：
[INFO] Reactor Build Order:[INFO][INFO] b2b-account-api [jar][INFO] b2b-account-service [jar][INFO] b2b-account [pom][INFO] b2b-order-api [jar][INFO] b2b-order-service [jar][INFO] b2b-order [pom][INFO] b2b [pom]
-rf b2b-order/b2b-order-service对上面的反应堆构件顺序进行裁剪，将b2b-order/b2b-order-service前面的部分干掉，从b2b-order/b2b-order-service开始执行构建操作，所以剩下了3个需要构建的模块。
总结
需要掌握
mvn命令中-pl、-am、-amd、-rf的各种用法注意
-pl后面的参数的写法：模块相对路径、或者[groupId].artifactId
还是那句话，上面这些用法大家会经常用到的，建议大家下去了多练练。看和操作，所获取到的是不能比的，看的过程中可能觉得一切都知道了，但是实际操作就不一样了，可能中间会遇到各种问题，然后自己会想办法解决这些问题，领会和学到的东西是不一样的！
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